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Sorry, but I'm not happy to pay a compulsory membership fee. Beyond paying an Internet Provider, I strongly believe that access to all web sites should be free and I don't bother to visit those which charge, whoever they are and whatever they provide.
As far as this site is concerned I consider that I already contribute enough in the form of help to others etc etc not to have to pay for access. Sorry, my view might be unpopular but I'm just being honest about my feelings in this respect.
If it must be done, then the suggestion of a £1 per "For Sale" item listing is a good and fair one, in my opinion.